Elastic fluid turbine packing



NOV.v 1, 1938. HERRLJNGER 2,135,304

ELASTIC FLUID TURBINE PACKING Filed June 16, 1956 l ua /z Wf/ /3 /7 l* Invento:

Fritz Herrlin er by/auyjuulq Patented Nov. 1, 1938 l UNITED STATES PATENroFrics ELASTIC FLUID TURBINE PACKING Fritz Herrlinger, Berlin-Charlottenburg',r Ger-v many, assignor to General Electric Company, a. corporation of New York Application June 16, 19st, serial No. 85,518

,In Germany September 21, 1935 3 Claims. (Cl. 286--10) The present invention relates to elastic uid meral I6 between the adjacent ends of the sleeves turbine packings of the labyrinth type, that is, I2., I3 is greater than the spacing Il between the to the kind of arrangement which usually inadjacent ends of the sleeves I3, I4 because the cudes an inner packing sleeve or element having sleeve I4 is subject to less expansion than the 5 circumferential teeth and being secured to the sleeve I 2. The left-hand end of the sleeve I2-in 5 l turbine shaft, and an outer packing element the present example has a shouldered portion provided with teeth on an inner cylindrical surengaging a shoulder It formed on the shaft I0 face and held on the turbine casing. The teeth secured thereto by means of a plurality, at least of one packing element project into the grooves three, circumferentially uniformly spaced dowel defined between adjacent teeth of the other packpins I9. Ihe dowel pins IS are disposed in radial 10 -ing element. Difficulties have been experienced bores in the sleeve and the shaft and are prewith this type of packing elements when used in vented from radial outward movement by lock connection with high pressure, high temperature screws 2i). Similarly, the right-hand end porelastic uid turbines because high pressures tion of the sleeve I3 forms a shoulder engaging i5 necessitate packing elements of considerable a shoulder 2i formed on the shaft and this right- 15 length, and high temperatures cause considerhand end portion of the packing sleeve i3 is seable expansion. The expansion determines the cured to the shaft by a plurality of circumferendistance between adjacent teeth. The distance tially, uniformly spaced dowel pins 22 held in or spacing must be suiiicient to prevent rubbing position by lock screws 23. The right-hand end of the teeth of one element against those of the of thev third sleeve Il! is secured to the shaft by 20 other element as the sleeves expand, taking into means of a screw 24 engaging a threaded portion consideration that the sleeve secured to the tur- 25 of the shaft and forcing the right-hand por. bine shaft, being subject to higher temperatures, tion of the packing sleeve I4 against a shoulder expands more than the sleeve supported on the 26 on the shaft. The axial as well as the radial g5 casing and furthermore, considering the fact that expansion of the sleeve I4 is considerably less 25 the expansion of the end portion of the sleeve than that of the other sleeves. Therefore no facing the turbine is relatively greater than the dowel pins or other means are provided with expansion of the other end portion of the sleeve regard t0 the Sleeve i4 t0 aSSule uniform, radial facing away from the turbine. expansion. Such dowel pin arrangement, how- 30 The Object of my invention is to provide an ever, is necessary with regard to the sleeves I2 30 improved construction and arrangement of labyand I3 to maintain concentricity between the rinth packings of the type described whereby inner packing Sleeves and the Outer packing the packing teeth may be closely spaced on the sleeves or elements. In the present instance, I outer surface of the inner sleeve. This is achave indicated an outer packing element 21 lf/5 complished in accordance with my invention by having teeth 28 projecting into the grooves 35 dividing thepacking sleeves into a plurality of formed by the packing teeth l5 0f the inner e1@-Y axially spaced elements or parts and providing ments. A subdivision of the outer packing sleeve means for securing oneend portion of each eleinto a plurality of axially spaced portions is in ment to the shaft, permitting free expansion of many cases not necessary because the outer pack- 4.9 the other end portion and at the same time assuring Sleeve iS not Subject t0 aS high temperatures 40 ing uniform radial expansion of the elements. as the inner packing sleeve.

For a better understanding of my invention, It Will be readily undei'S'COOd that With this attention is directed to the following description arrangement the SDaCing Of the peeking teeth 0f and the claims appended thereto in connection the outer sleeve and consequently also that of with the accompanying drawing in which the the inner sleeve must be at least equal to the 45 single figure represents an elastic fluid turbine maximum expansion of the sleeve I2 which is expaking arrangement embodying my invention. posed to the highest temperature changes. But

In the present instance, I have shown a solid the spacing of the packing teeth may be much type turbine rotor having a shaft I0 with a bucket less than the maximum total expansion of the wheel or disk I I integrally united therewith. The three axially spaced sleeves on the shaft because .5o packing arrangement according to my invention the expansion of one sleeve does not affect the comprises in the present instance three sleeves expansion of the others. l2, I3, and I4 having gIOOVed Outer' SUIaCeS 150 What I claim as new and desire to secure by form teeth I5 thereon. The sleeves are axially Letters Patent of the United States is:

spaced apart. The spacing designated with nu- 1, A rotary shaft packing arrangement sub- 55 ject to great temperature changes during operation including the combination of a shaft, an inner packing element directly secured to the adjacent shaft portion, Vand an outer stationary packing element having an inner surface with packing teeth, said inner packing element comprising a plurality of axially spaced separate vsurfaces into which packing element project, the separaportions with packingV grooves on their outer the packing teeth of the stationary tion of said portions preventing expansion of one portion from being transmitted to the other and thereby permittingrelatively close spacing of the teeth and the grooves. i

2. An elastic fluid turbine packing arrangement including Vthe combination of a shaft having a free end, a plurality of axially spaced packing sleeves having grooved outer surfaces surrounding the shaft, means for directly connecting a-.portion of each packing sleeve to an adjacent shaft portion to assure uniform radial expansion of the entire sleeve and to permit free axial expansion of the other portions of the sleeves, the

axial spacing between the sleeves decreasing to- Wards the free end of the shaft. and an outer stationary packing element having an inner surface with packing teeth surrounding the packing sleeves with the packing teeth projecting into the grooves formed in the outer surface ofthe sleeves. l

3. An elastic fluid turbine packing arrangement including the combination of a solid type turbine rotor havinga shaft, a plurality of axially FRITZ' HERRLLNGER. 

